Following up on yesterday's update of adding a Webmention form on IndieNews' Webmention endpoint, today I finished building out the UI for submitting to IndieNews from a browser.
Now the "Submit" link includes a form where you can paste in your post's URL, in case your website doesn't send Webmentions automatically.
If you use this form to send the Webmention, then the response will be an HTML page instead of a JSON response. If the submission is successful, then it will actually return a 302 redirect to the IndieNews permalink of the post! This is a slight deviation from the Webmention spec, but it's fine because we don't really care if the browser is a spec-compliant Webmention client.
Also thanks to Chris Aldrich for the suggestion of using a dropdown for the target URL selection on the generic Webmention form.
This is the form you see when you visit the Webmention endpoint, which is not specific to the language you're on.